urls: fix over-matching single spaced paths

This commit adds a negative lookahead `(?!\w+://)` to both
`dotted_path_space_segments` and `any_path_space_segments`. This
prevents the space-segment matching from consuming text that starts with
a URL scheme (like http://), which was causing /tmp/test.txt
http://www.google.com to over-match.

Fixes
https://github.com/ghostty-org/ghostty/issues/1972#issuecomment-3882254792

src/config/url.zig

@@ -61,11 +61,11 @@ const non_dotted_path_lookahead =
 ;
 
 const dotted_path_space_segments =
-    \\(?: [\w\-.~:\/?#@!$&*+;=%]*[\/.])*
+    \\(?: (?!\w+:\/\/)[\w\-.~:\/?#@!$&*+;=%]*[\/.])*
 ;
 
 const any_path_space_segments =
-    \\(?: [\w\-.~:\/?#@!$&*+;=%]+)*
+    \\(?: (?!\w+:\/\/)[\w\-.~:\/?#@!$&*+;=%]+)*
 ;
 
 // Branch 1: URLs with explicit schemes (http, mailto, ftp, etc.).
@@ -226,6 +226,10 @@ test "url regex" {
             .input = "match git://example.com git links",
             .expect = "git://example.com",
         },
+        .{
+            .input = "/tmp/test.txt http://www.google.com",
+            .expect = "/tmp/test.txt",
+        },
         .{
             .input = "match tel:+18005551234 tel links",
             .expect = "tel:+18005551234",